Rapid Beeping Sound (during Start-up System Check) Disappeared (?)

My 550 makes the noise. With the door closed, it lasts around 5 seconds and stops shortly before "Check OK" is displayed. With the door open, the tone continues, but the frequency changes after the first 5 seconds.

 

I can't find any reference to a buzzer (or segnalatore acustico) in the 456 and 550 parts manuals. These warning buzzers seem only to be found on US cars and most of the wiring diagrams refer to the Euro cars.

Whereabouts does the sound come from? In the instrument binnacle? Under the dash? In the passenger footwell?

 

On the non-M car, there is a buzzer which seems to be mounted in the passenger footwell

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Part number is 61830700. It may not be available new (I see the used price is more than the published new price, a good sign that it is NLA).

If the 456 is the same, check for water ingress. You can probably pull the cover off and check for broken circuit board tracks, etc.

(EDIT: I see the USA/Canada/Japan version of is module is not like a relay, but like a mini-speaker)

https://www.ebay.com.au/itm/Ferrari-328-Others-Seat-Belt-Warning-Buzzer-Part-61830700-/121687897325

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It looks like the same warning module as the ones found on 348's, 355's, etc. The Euro versions are like relays and don't have the speaker function.

 

In both my euro 456M and my euro 550, the buzzer is on for about 5 seconds to tell you to put on your seat belt. If I put it on before I turn on the ignition, there is no buzzer at all because the belt is already on! Is that the one you are talking about? It has nothing to do with the system check!!

 

Perhaps on the Euro 456M and 550 there are separate modules/circuits, but the circuits are not shown in the wiring diagrams. Does the Multifunction Display have an inbuilt buzzer? On the 456M Euro car, the wiring diagrams show the seat belt signal going from the driver's seat directly to the Multifunction Display.

For info (off topic):

The 456 (non-M) module with part number 61830700 is found on USA/Canada/Japan cars and has multiple functions (at least on the F355). It covers both the brake warning system (light test) during startup and the seat belt/door warning buzzer function.

I don't know complete internal circuitry, but it has 8 pins (although pin 7 has been removed).

1. door open input
2. input from driver's seat belt lock
3. power
4. output to seatbelt warning light
5. earth
6. output to brake warning light
7. -
8. voltage from ignition lock in Start position

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The Euro F355's have a different module, because there is no buzzer for seat belts.

 

The 550 WSM lists many of the inputs going into the Multifunction (digital) display module. One input is:

"Temperature selection/buzzer enabling (Gulf version) - analog"

If there is only one pin for both temperature selection and buzzer enabling, I can't see how both Euro and US cars can have buzzers.

 

I traced the wiring in the WSM for that pin on the Multifunction Display and it simply goes to the the Outside Air Temperature Pushbutton. I wonder if there is a "Gulf" version of Multifunction Display. The mystery deepens. Perhaps it's some secret Ferrari stuff that when you push the OAT button for a certain time period or in combination with something else, it enables the seat belt chime. Maybe there is some sort of programming.

I notice in photos of the Digitek Multifunction Display that there are no speaker grilles. If the speaker/s are in there, I guess we can assume the sounds go through the plastic.

Ignorance is sometimes bliss... but then things break

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Some of those un-labelled pins are used for the "gear selected" display on the 456MGTA

 

Indeed.

I basically knew nothing about the startup check on the M car and 550's until yesterday, so I'll have to do some reading. Maybe the Multifunction display needs an input from the immobiliser, but what data it's looking for and on what pin remains to be seen. Does the startup buzzer continue until the car is actually started or does it time out?

 

LOL.

Do you still get the "CHECK OK", even though the audio has gone?

 

Mirek, the ignition has to remain in the off position for a while in order to get the beeping alert during the system check routine. That's how it works in my 1999 550.

Barry

 

Interesting. I just noticed some time ago, in the 550 and 456M wiring diagrams, a switch in the ignition lock which sends a voltage to the Multifunction Display Module (pin B4). This pin is labled "inserted key input". Perhaps this switch starts up some kind of timer for the system check.

 

Most likely, Ian. And I'm pretty sure the key has to be removed as well.

 

Removed prior to start????

 

Sorry, off topic again, but I think I just solved another Multifunction Display mystery which has been bugging me for a while. How does the display get outside air temperature? It uses data from the sensor under the driver's mirror, but there is only wiring from the mirror to the HVAC/DIAVIA ECU. It must be the DIAVIA ECU which sends temperature data on a serial data wire to the Multifunction Display. i.e. pin A15 (see graphic in post #10).

 

Is that anything like a teleflex drive cable?

 

Stay on the bomb run, boys. I'm gonna get them doors open if it hairlips everybody on Bear Creek.

Mirek, as Ian mentioned, there could be a timer involved with the beeping alert. I've experienced restarting the engine without hearing the alert yet seeing the CHECK OK light after several seconds prior to cranking the engine. It occurs when I shut down the engine for a few minutes. There have been times when I started the engine before the system check routine completed, beeping or not, with no ill effects. I'm convinced that the engine has to be off for a while before the timer, wherever it is, resets the audible beeping alert. I'm just not sure how long "a while" is.

My 550's window button lights remain illuminated for about five minutes after I've shut down the car. Maybe it's the same timer.